Walking aid



FIG. 1 is a perspective view of a walking aid

FIG. 2 is a bottom view thereof

FIG. 3 is a top view thereof; and,

FIG. 4 is a left side view, with the right side view being a mirror image thereof.

The dash-dash-dash broken lines depict portions of the article that form no part of the claimed design.

The dot-dash-dot lines indicate the boundary of the claim and form no part of the claimed design. 

CLAIM I claim the ornamental design for a walking aid, as shown and described. 